Science Lesson Kit · Teacher Resource
Ecosystem Modeling: What Happens When One Population Changes? — 5E Lesson Plan
Life Science · 50 minutes
Grade 4
5E lesson flow
01
Engage
6 min
Teacher Does
Show a meadow photo and ask students to identify connections they can support with evidence.
Students Do
Name organisms and possible feeding/resource relationships.
Ask
- Which connection can you support from the evidence?
Look For
Specific relationships rather than vague 'everything is connected' statements.
02
Explore
15 min
Teacher Does
Give groups organism cards and arrows to build a simple meadow model.
Students Do
Build, explain, and test the model with a rabbit-decrease scenario.
Ask
- If this population changes, which arrows should you follow first?
Look For
Direct connections before indirect predictions.
03
Explain
9 min
Teacher Does
Introduce ecosystem, population, producer, consumer, decomposer, and model.
Students Do
Label roles and explain one model connection.
Ask
- What does the arrow represent?
Look For
Students state and use the arrow rule consistently: food or matter source → consumer.
04
Elaborate
13 min
Teacher Does
Provide population data and new evidence that hawks also eat mice.
Students Do
Compare prediction with data, add the missing connection, and revise their explanation.
Ask
- How does the new connection change your prediction?
Look For
Model revision rather than replacement of all prior connections.
05
Evaluate
7 min
Teacher Does
Present a new pond model.
Students Do
Make one careful prediction and name evidence that could test it.
Ask
- What evidence would strengthen or challenge your prediction?
Look For
Observable or countable evidence and careful language.
Student goal
I can use and revise an ecosystem model to explain how a population change may affect connected organisms.
Learning objectives
- Build a model that shows feeding and resource connections among organisms in an ecosystem.
- Use a model and data to predict possible effects of a population increase or decrease.
- Revise an ecosystem model when new evidence shows an important connection was missing.
Materials
- Meadow organism photo cards
- Arrow cards or yarn
- Population data cards
- Large paper or reusable mats
- Pencils
Before class
- Prepare a meadow model set with grass, rabbits, mice, hawks, and decomposers.
- Keep the first model intentionally simple so students can revise it when new evidence appears.
- Prepare a short rabbit/grass data set.
- Use one explicit arrow rule throughout: food or matter source → consumer (for example, grass → rabbit).
- Open Teach Mode.
Prior knowledge
- Plants and animals need resources.
- Organisms can be connected through feeding relationships.
Vocabulary
- ecosystem
- Living things and the nonliving parts of an area interacting together.
- population
- A group of the same kind of organism living in one area.
- producer
- An organism, such as a plant, that makes its own food using light energy.
- consumer
- An organism that gets energy by eating other organisms.
- decomposer
- An organism that breaks down dead material and returns matter to the environment.
- model
- A representation used to explain, predict, or test an idea.
Differentiation
- Use color-coded organism role cards.
- Provide sentence frames: If ___ decreases, ___ may ___ because ___.
- Allow students to trace arrows with a finger before writing.
- For extension, ask students to compare two possible outcomes when an organism has more than one food source.
Assessment
- Check model arrows and role labels.
- Listen for careful predictions.
- Check use of data as evidence.
- Check whether students revise the model appropriately when new evidence appears.
Exit ticket
Choose one model connection. Explain how a change in one population could affect another and name one piece of evidence you would collect.
Extension
Add one locally relevant organism to the class ecosystem model and justify its connection using a reliable observation or source.